Test Adapter Schematic - Vertex Standard VX-900 Service Manual

Connector Pinout Diagram
AF Test Adapter Schematic
YAESU P/N: T9206933
Because of the bridge audio amplifier circuit used in the VX-900, it is necessry to construct
and use a simple audio load test adapter as shown in the schematic diagram above, when con-
ducting receiver alignment steps.
Do not connect either side of the speaker leads to chassis "ground."
Pin 2 (Speaker -)
Pin 4 (MIC)
White (Pin 1: Speaker +)
16-ohm
2w
Blue (Pin 2: Speaker -)
Red (Pin 4: MIC)
Green (Pin 5: Select)
N.C. Yellow (Pin 7: Clone)

Test Adapter Schematic

Pin 1 (Speaker +)
Pin 3 (GND)
Pin 5 (Select)
Pin 7 (Clone)
Attenuated
Test Output (1/2)
220µF
+
AF Output
220µF
+
Shield (Pin 3: GND)
Audio Generator
+
1µF
PTT
2.2K-ohm
Note!
25